Winners of Nasa's Let It Snow photography contest

Snowfall San Diego Style, by Judith Lea Garfield. La Jolla Shores, La Jolla, California. Judith explains: "Most of my time is spent under water, except right after a storm when I go to the beach to play in the snow. Winter storms bring extreme tides, which interact in a singular way with the ocean's giant kelp to create a snowfall with a twist. Winds whip up the ocean, causing kelp strands to break, which releases their alginate (a nontoxic, viscous substance) into the water. The slippery alginate is like bubble bath, and the churning ocean is like a faucet of running water. The resulting suds, called seafoam, pile up on the water's surface. Onshore winds then blow the meringue to shore. As the tide ebbs, a winter wonderland is left in its wake (so to speak). Let it snow SoCal style!"Picture: Judith Lea Garfield/NASA/Rex Features